Daikin EWWQ380B-SS, Installation, Operation And Maintenance Manual

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External water Setpoint reset
– Electrical wiring (Optional)
The
machine’s local setpoint can be modified by means of an external analogue 4-20 mA signal. Once this function has
been enabled, the microprocessor allows to modify the setpoint from the set local value up to a differential of 3°C. 4 mA
corresponds to a 0°C differential, 20 mA corresponds to the setpoint plus the maximum differential.
The signal cable must be directly connected to terminals 35 and 36 of the M3 terminal board.
The signal cable must be of the shielded type and must not be laid in the vicinity of the power cables, so as not to induce
interference with the electronic controller.
Unit limitation
– Electrical wiring (Optional)
The machine
’s microprocessor allows to limit the capacity by means of two separate criteria:
- >Load limitation: The load can be varied by means of a 4-20 mA external signal from a BMS.
The signal cable must be directly connected to terminals 36 and 37 of the M3 terminal board.
The signal cable must be of the shielded type and must not be laid in the vicinity of the power cables, so as not
to induce interference with the electronic controller.
- Current limitation: The
machine’s load can be varied by means of a 4-20 mA external signal from an external
device. In this case, current control limits must be set on the microprocessor so that the microprocessor
transmits the value of the measured current and limits it.
The signal cable must be directly connected to terminals 36 and 37 of the M3 terminal board.
The signal cable must be of the shielded type and must not be laid in the vicinity of the power cables, so as not
to induce interference with the electronic controller.
A digital input allows to enable the current limitation at the desired time. Connect the enabling switch or the
timer (clean contact) to terminals 5 and 9.
Attention: the two options cannot be enabled simultaneously. Setting one function excludes the other.
Fig. 5
– User connection to the interface terminal board
LEGEND
1S Compressor Status 1 PS Power Supply
2S Compressor Status 2 Q10 Main Switch
Al Analog Inputs S.O. Setpoint Override
AO Analog Output TW 1
Tower 1 Fan Step
C-3W Condenser 3-W ay Valve TW 2
Tower 2 Fan Step
C.L. Current Limit TW 3
Tower 3 Fan Step
CFS Condensator Flow Switch TW 4 Tower 4 Fan Step
CLE Current Limit Enable
CP-VFD Condenser Pump VFD
D.L. Demand Limit
DI Digital Inputs